Problem Solving
试题详情
题目：
For any positive integer n, the sum of the first n positive integers equals [n(n+1)]/2. What is the sum of all the even integers between 99 and 301?
选项:
A、 10,100
B、 20,200
C、 22,650
D、 40,200
E、 45,150
答案:
B
提问：
For any positive integer n , the sume of the first n positive integers equal [n/(n+1)]/2.What is the sum of all the even integers between 99and 301?
A10100 B 20200 C 22650 D 40200 E 45150
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